Preventing device for bound of preset automatic diaphragm of single-lens reflex camera

Abstract

Abstract PURPOSE:To prevent the miss of a shutter release oppotunity, by allowing two pins of a diaphragm preset ring, which is provided over a cam ring and is turned around the optical axis, to face each other and stopping down an automatic diaphragm while being damped as prescribed in accordance with the set value of the preset ring. CONSTITUTION:A part of a cam ring 7 surrounding the optical path of a lens is supported pivotally to charge the cam ring 7 to the side of diaphragm opening by a spring, and a pawl part is projected on the inside of the cam ring 7 in a position facing the pivotally supporting position and is used as a part to be engaged with an automatic diaphragm opening and closing ring 10 for stopping- down. Recessed cam parts 8a and 8b are provided on the inside in left and right middle parts, and two pins 5a and 5b of a diaphragm set ring 4 which is provided over the cam ring 7 and is turned around the optical axis are allowed to face these recessed cam parts 8a and 8b respectively, and the automatic diaphragm is stopped down while being damped as prescribed in accordance with the set value of the preset ring 4 and is stopped by a preset value.

Inventors

• 👤 Itsuki Moriyama
• 👤 森山　五樹

Bibliographic Details